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package com.diozero.util;
/*
* #%L
* Organisation: diozero
* Project: Device I/O Zero - Core
* Filename: DiozeroScheduler.java
*
* This file is part of the diozero project. More information about this project
* can be found at http://www.diozero.com/
* %%
* Copyright (C) 2016 - 2021 diozero
* %%
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
* #L%
*/
import java.util.Map;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.function.Consumer;
import java.util.function.Supplier;
import org.tinylog.Logger;
public class DiozeroScheduler {
private static DiozeroScheduler daemonInstance;
private static DiozeroScheduler nonDaemonInstance;
private ExecutorService executor;
private ScheduledExecutorService scheduler;
private DaemonThreadFactory threadFactory;
public static synchronized DiozeroScheduler getDaemonInstance() {
if (daemonInstance == null || daemonInstance.isShutdown()) {
daemonInstance = new DiozeroScheduler(true);
}
return daemonInstance;
}
public static synchronized DiozeroScheduler getNonDaemonInstance() {
if (nonDaemonInstance == null || nonDaemonInstance.isShutdown()) {
nonDaemonInstance = new DiozeroScheduler(false);
}
return nonDaemonInstance;
}
public static void shutdownAll() {
if (daemonInstance != null) {
daemonInstance.shutdown();
}
if (nonDaemonInstance != null) {
nonDaemonInstance.shutdown();
}
}
private DiozeroScheduler(boolean daemon) {
threadFactory = new DaemonThreadFactory(daemon);
executor = Executors.newCachedThreadPool(threadFactory);
scheduler = Executors.newScheduledThreadPool(50, threadFactory);
}
public void execute(Runnable r) {
executor.execute(r);
}
public Future submit(Runnable r) {
return executor.submit(r);
}
public ScheduledFuture scheduleAtFixedRate(Runnable r, long initialDelay, long period, TimeUnit unit) {
return scheduler.scheduleAtFixedRate(r, initialDelay, period, unit);
}
public ScheduledFuture invokeAtFixedRate(Supplier source, Consumer sink,
long initialDelay, long period, TimeUnit unit) {
return scheduler.scheduleAtFixedRate(() -> sink.accept(source.get()), initialDelay, period, unit);
}
private void shutdown() {
executor.shutdownNow();
scheduler.shutdownNow();
Logger.trace("Shutdown - done");
}
public boolean isShutdown() {
return executor.isShutdown() || scheduler.isShutdown();
}
static class DaemonThreadFactory implements ThreadFactory {
private static final AtomicInteger poolNumber = new AtomicInteger(1);
private final boolean daemon;
private final ThreadGroup group;
private final AtomicInteger threadNumber = new AtomicInteger(1);
private final String namePrefix;
DaemonThreadFactory(boolean daemon) {
this.daemon = daemon;
SecurityManager s = System.getSecurityManager();
group = (s != null) ? s.getThreadGroup() : Thread.currentThread().getThreadGroup();
namePrefix = (daemon ? "daemon" : "non-daemon") + "-pool-" + poolNumber.getAndIncrement() + "-thread-";
}
@Override
public Thread newThread(Runnable r) {
Thread t = new Thread(group, r, namePrefix + threadNumber.getAndIncrement(), 0);
t.setDaemon(daemon);
return t;
}
void status() {
Logger.debug("[" + (daemon ? "daemon" : "non-daemon") + "] activeCount=" + group.activeCount() +
", activeGroupCount=" + group.activeGroupCount());
}
}
public static void statusAll() {
Map stacks = Thread.getAllStackTraces();
for (Map.Entry entry : stacks.entrySet()) {
Logger.debug("Stack trace elements for Thread " + entry.getKey().getName() + ":");
for (StackTraceElement element : entry.getValue()) {
Logger.debug(element.toString());
}
}
daemonInstance.status();
nonDaemonInstance.status();
}
private void status() {
threadFactory.status();
}
}
